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Diagram of Decision Tree Markov Model for Each Treatment. Referring to the nature course of stable COPD and AECOPD, decision tree Markov model has been established to conduct the research. The Markov model has been defined with three Markov States, namely, GOLD1-2, GOLD3-4, and death. Each state in the model transfers to other states or itself in a certain probability each year according to the arrow direction in the graph.
